VMware ESXi 4.0 Update 1 and Later Installable with vCenter Server 4.0 Update 1 and Later

vSphere Basic System Administration : Getting Started : Using the vSphere Client

Using the vSphere Client
The vSphere Client serves as the principal interface for administering vCenter Server and ESX/ESXi.
The vSphere Client user interface is configured based on the server to which it is connected:
When you first log in to the vSphere Client, it displays a Home page with icons that you select to access various vSphere Client functions. When you log out of the vSphere Client, the client application remembers the view that was displayed when it was closed, and will return you to that view when you next log in.
You perform many management tasks from the Inventory view, which consists of a single window containing a menu bar, a navigation bar, a toolbar, a status bar, a panel section, and pop-up menus.